I'm trying to tail a log file, and pull out meaningful lines to save in
a different file. This command does what I want:

tail -f log.file | grep '^\|' | grep "stockA\|stockB\|stockC\|stockD" |
grep -v "DEBUG\|INFO\|WARN"

but when I add to the end of it: >> goodlog.file

i find that no data is written to goodlog.file.

Any would be greatly appreciated.

On 5 Dec 2006 10:21:48 -0800, nortonloaf@comcast.net
<nortonloaf@comcast.net> wrote:
> I'm trying to tail a log file, and pull out meaningful lines to save in
> a different file. This command does what I want:
>
> tail -f log.file | grep '^\|' | grep "stockA\|stockB\|stockC\|stockD" |
> grep -v "DEBUG\|INFO\|WARN"
>
> but when I add to the end of it: >> goodlog.file
>
> i find that no data is written to goodlog.file.
>
> Any would be greatly appreciated.
>
Maybe the data is being buffered and will be written to the file when
the buffer is full.

--
I respect faith, but doubt is what gives you an education.
-- Wilson Mizner

Bill Marcum wrote:

> Maybe the data is being buffered and will be written to the file when
> the buffer is full.

Hi,

Thanks for the response, I appreciate it.

Do you know if it is possible to force it to write to the file right
away?

2006-12-5, 11:58(-08), nortonloaf@comcast.net:
>
> Bill Marcum wrote:
>
>> Maybe the data is being buffered and will be written to the file when
>> the buffer is full.
>
> Hi,
>
> Thanks for the response, I appreciate it.
>
> Do you know if it is possible to force it to write to the file right
> away?

Try:

tail -f log.file |
gawk '
/stock[A-D]/ && ! /DEBUG|INFO|WARN/ {
print
fflush()
}' > file

If you don't have gawk, use awk instead and system("") instead
of fflush().

If your grep is the GNU grep (as would suggest your "\|"), you
can use the --line-buffered option.

--
Stéphane